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tree-ssa-pre.c (name_to_id): New global.

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2010-01-06  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-pre.c (name_to_id): New global.
	(alloc_expression_id): Simplify SSA name handling.
	(lookup_expression_id): Likewise.
	(init_pre): Zero name_to_id.
	(fini_pre): Free it.

From-SVN: r155676
This commit is contained in:
Richard Guenther 2010-01-06 17:08:25 +00:00 • committed by Richard Biener
parent 86d1b9d1e0
commit 13de9095bd
2 changed files with 42 additions and 7 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2010-01-06 Richard Guenther <rguenther@suse.de>
* tree-ssa-pre.c (name_to_id): New global.
(alloc_expression_id): Simplify SSA name handling.
(lookup_expression_id): Likewise.
(init_pre): Zero name_to_id.
(fini_pre): Free it.
2010-01-06 Uros Bizjak <ubizjak@gmail.com>
* ifcvt.c (if_convert): Output slim multiple dumps with TDF_SLIM.

41
gcc/tree-ssa-pre.c
View file

@ -236,6 +236,7 @@ DEF_VEC_P (pre_expr);
DEF_VEC_ALLOC_P (pre_expr, heap);
static VEC(pre_expr, heap) *expressions;
static htab_t expression_to_id;
static VEC(unsigned, heap) *name_to_id;
/* Allocate an expression id for EXPR. */
@ -247,9 +248,23 @@ alloc_expression_id (pre_expr expr)
gcc_assert (next_expression_id + 1 > next_expression_id);
expr->id = next_expression_id++;
VEC_safe_push (pre_expr, heap, expressions, expr);
slot = htab_find_slot (expression_to_id, expr, INSERT);
gcc_assert (!*slot);
*slot = expr;
if (expr->kind == NAME)
{
unsigned version = SSA_NAME_VERSION (PRE_EXPR_NAME (expr));
/* VEC_safe_grow_cleared allocates no headroom. Avoid frequent
re-allocations by using VEC_reserve upfront. There is no
VEC_quick_grow_cleared unfortunately. */
VEC_reserve (unsigned, heap, name_to_id, num_ssa_names);
VEC_safe_grow_cleared (unsigned, heap, name_to_id, num_ssa_names);
gcc_assert (VEC_index (unsigned, name_to_id, version) == 0);
VEC_replace (unsigned, name_to_id, version, expr->id);
}
else
{
slot = htab_find_slot (expression_to_id, expr, INSERT);
gcc_assert (!*slot);
*slot = expr;
}
return next_expression_id - 1;
}
@ -266,10 +281,20 @@ lookup_expression_id (const pre_expr expr)
{
void **slot;
slot = htab_find_slot (expression_to_id, expr, NO_INSERT);
if (!slot)
return 0;
return ((pre_expr)*slot)->id;
if (expr->kind == NAME)
{
unsigned version = SSA_NAME_VERSION (PRE_EXPR_NAME (expr));
if (VEC_length (unsigned, name_to_id) <= version)
return 0;
return VEC_index (unsigned, name_to_id, version);
}
else
{
slot = htab_find_slot (expression_to_id, expr, NO_INSERT);
if (!slot)
return 0;
return ((pre_expr)*slot)->id;
}
}
/* Return the existing expression id for EXPR, or create one if one
@ -4483,6 +4508,7 @@ init_pre (bool do_fre)
value_expressions = VEC_alloc (bitmap_set_t, heap, get_max_value_id () + 1);
VEC_safe_grow_cleared (bitmap_set_t, heap, value_expressions,
get_max_value_id() + 1);
name_to_id = NULL;
in_fre = do_fre;
@ -4544,6 +4570,7 @@ fini_pre (bool do_fre)
free_alloc_pool (pre_expr_pool);
htab_delete (phi_translate_table);
htab_delete (expression_to_id);
VEC_free (unsigned, heap, name_to_id);
FOR_ALL_BB (bb)
{